Multiple functional, foldable, and portable ladder

Abstract

A multiple functional, foldable, and portable ladder comprises a plurality of ladder units 5, wherein the ladder unit has a supporting rod on the two sides thereof. Each supporting rod is foldable so that the ladder is expandable for upstanding or foldable so as to be carried and stored and be used in emergency. Thus the ladder is convenient in application and storage. Two supporting rods between two adjacent ladder units 5 are pivotally connected by pivotal shafts, and two ends of each pedal are installed with respective control seats. A pivotal shaft and a movable buckling rod are installed within the control seat. Thereby, when the ladder is expanded, the supporting rod of the ladder unit is assembled by the control seat, during folding, the supporting rods are folded after the buckling rods has been displaced.

What is claimed is: 
     
       1. A foldable and portable ladder comprising a plurality of ladder units, wherein each ladder unit is comprised of two parallel supporting means, a step means provided between the supporting means, and control means provided on either side of the step means posterior to the supporting means,   and wherein adjacent ladder units are pivotally connected by pivotal shafts and the control means comprising an upper block, a lower block symmetrical to the upper block, said upper and lower block forming between them a transversal round hole and a long hole, each block having a regulating groove located within and transverse to the round and long holes, a regulating ring is provided within the regulating groove, a buckling rod extending through the regulating ring, and a regulating spring, wherein the control means serves to buckle or unbuckle adjacent ladder units in order to render the ladder rigid or collapsible, respectively.   
     
     
       2. The ladder of claim 1 wherein the supporting means comprise a connecting plate with assembling tubes integrally formed on each side thereof. 
     
     
       3. The ladder of claim 1 wherein a top ladder unit is provided with suspension means to allow the ladder to be suspended from a building. 
     
     
       4. The ladder of claim 1 wherein a bottom ladder unit is provided with footing means to stabilize the ladder.